Fourspine Stickleback

Also called: Stickleback

Small olive-silver fish with a narrow tail base and usually four isolated dorsal spines ahead of the soft dorsal fin.

Shallow vegetated coastal waters, estuaries, and some freshwater areas.

Feeds on small invertebrates; males build and guard nests.

Primarily an identification species.

Uses brackish and coastal waters and may enter freshwater; shown in both listings under the brackish convention.